Do I need to be quarantined when I go to Lhasa in June?

No, most areas have higher altitudes and large temperature differences between day and night. The climate in winter and early spring is dry and cold, with strong wind and sand, and the oxygen content in the air is significantly lower than in summer, and many areas and road sections are covered with ice and snow. Now June is just right, and there will be more rain in July and August

It depends on where your household registration is, except for the Northeast, Beijing, Hubei, and Guangdong, generally you will not be quarantined, unless you are traveling with someone from a high-risk area or has an abnormal test.